But having gone 350 starts before he got his first win in the super bowl of stock car racing hes quite OK with the predicament. I think in terms of the racing and speeds, theyll be very similar. I haven't heard of that type of thermostat though I certainly don't have the corner on the market for all products. Certainly thermostats fail but it isn't an every day occurrence. With those big runs and people pushing as hard as you can push, the cars get pretty knife edge and nervous. Allison became the oldest Daytona 500 winner, too . Position the hole at 12 oclock when you install it. "I don't think there will be a lot of change," said 2012 NASCAR champion Brad Keselowski, who has won four of the last 20 races at Daytona and Talladega. I think this thermostath will work, have them seen on several 351 Cl. In the 1970s some teams such as Hoss Ellington were able to rig devices to their manifolds that could move the plate to increase fuel-air mixture and thus horsepower. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. Real NASCAR racing, real fast. YouTubes privacy policy is available here and YouTubes terms of service is available here. You must log in or register to reply here. Slowing down the cars was the quick and easy fix. Instead, Toyota decided to place their restrictor plate in a position where it would actually have no impact on the performance of the turbocharged engine. If I hadnt done it, somebody else would have come along and done it. Truck had 160000km or 100K miles at the time of failure. Buy newspaper front pages, posters and more. Simply click on each question to display the answer. Octagonal Restrictor: This can be left in place and used in either 4 or 8-way mode with no need to move the plate between each mode. Estimated Ship Date: Today. No Thermostat-The final test involved removing the thermostat entirely. This is about the minimum size you should use. Putting in a restrictor changes many other conditions throughout the system (including conditions inside the radiator) that effects overall heat exchange. Drivers will still have more horsepower than they used to, going from an estimated 410 to a targeted 550. 25, 2021, 7:05 a.m. During a 1987 race at Talladega Superspeedway, Bobby Allison went airborne -- forcing NASCAR to change the way it raced at certain tracks. The Thermostat that is Offered from Tmeyer.com and at FlowkoolerBoth SHOWING the 'Copper Sleeve/Skirt/Hat'Are the CORRECT 333-*** (add chosen 'F' Temp here), Thermostat for the FORD 351 Cleveland Block, and MUST be Used with the Correct 'Brass restrictor Plate', that Conforms with that Copper Skirt!! !.so get Educated! We're sorry. Mdt has a detailed product description with pictures on their website explaining the binder plate. Is 2021 Daytona a restrictor plate race? Tapered spacers have been used in NASCAR's Cup Series since 2015, when a 1.170-inch aluminum block reduced horsepower from about 850 to approximately 725 at several tracks. When you block a person, they can no longer invite you to a private message or post to your profile wall. A restrictor plate (or the tapered spacer) slows cars down by preventing them from bring air into the engine as quickly as without the plate or spacer. I assume we're all going to tear more stuff up this year. You cant stop quick enough and youre only going 70, you know? You really cant afford to now at all, so you know youre just really having to stay in the gas and just drag a lot of brake to slow the car down to keep the engine wound up., Reddick said that creates crazy racing, but not better or worse, just different.. Roger, FFR 5168 MK II , 5.0,170 Trick Flow heads,Explorer Intake,75mm MAF,75TB,24lb injectors,Trickflow cam, Liberty built T5,4 link,Konis,Viper Red. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Seems like pretty good insurance and reliability to me. I understand that they are out there, but do they realy work that way? Im sure that you can find a combination of long slides and restrictor plates that will meet your requirements. I have a home built 4 player sit down arcade table (cocktail and side by side) with 4 cheap Sanwa-style arcade joysticks. Who talks about reinventing lukewarm water? I had a fail safe thermostat in my 2011 Ram 1500. This speed was recorded by Kevin Harvick. End Of Story! But if theres one thing NASCAR broadcasts get really, really right, its the technical breakdowns of the cars and racing. The only situation where that style thermostat is functioning correctly in a Cleveland is only when the factory installed brass block off plate pressed into the engine block has been completely sealed. There was a lot of engine inventory already out there. Now, there's an alternative to restrictor-plate racing. But, thanks for the reply. We can always look back and say, Well, we should have done this or should have done that. Here we are 32 years later, and if they would have left the engines unrestricted, guys would be doing 230-plus now.. This plate restricts the flow of air and gasoline. The Animal Quarter Midget rookie engine uses a combination of both the Briggs long slide and the 3 hole .250 black restrictor plate. Plate racing has drawn plenty of criticism over the years, mostly from drivers and team owners who prefer cars not be bunched together in two- and three-wide packs at nearly 200 mph and where the slightest contact creates a chain reaction and often mangles a bunch of $300,000 cars. Are restrictor plates still used? The date was Oct. 7, 2012, and I was standing in the Sprint Cup garage just moments after . I just dont understand, when the OEM-style block off plates and thermostats are readily available, why anyone would modify the Ford engineered cooling/bypass system. I imagine it could be possible the vendor purchased an incorrectly labeled thermostat and innocently resold it to you. With the Lig Golds I was running 2/9 and was getting good heat and it was pretty efficient on pellets. The restrictor plate has to do with your "coal" case overall length. 2023 USA TODAY, a division of Gannett Satellite Information Network, LLC. Most high performance manifolds have it blocked. I don't know what to use to race the '70 cars with. But NASCAR announced it would move to tapered spacers at Daytona and Talladega this season late last year, and that the change would happen after the season-opening Daytona 500leaving three races, since each track gets two points races per season in the Cup Series. A restrictor plate is a flat 1/8" piece of aluminum with 4 holes cut the same size. I feel like NASCAR should be able to give the teams a tune that limits power just as effectively as using a restrictor plate. Plus imagine all the testing nascar would have to do to get the tunes right on all the different engines. The move means a few changes: namely, taking power from the restricted 410 horsepowerto about 550 HP, while adding aero ducts, larger spoilers and larger splitters to increase drag and offset the added power. Restrictor Plates One part of a NASCAR car engine that was implemented for safety reasons is now being pointed at as the cause for many of the multi-car accidents during races. Cookie Settings/Do Not Sell My Personal Information. This term "restrictor plate" is often thrown around by NASCAR drivers, and it's easy to ignore. Teams had already begun preparing for the 500, so we wanted to hold the line there for 2019. Waiting for George to step in.. Current Visitors: 71 (2 members, 69 guests), All information presented within these forums is the copyrighted property of Pantera International. JavaScript is disabled. I dont think there will be a lot of change, said 2012 NASCAR champion Brad Keselowski, who has won four of the last 20 races at Daytona and Talladega. stockers about several things.he was telling me he used to run with a plate of aluminum with a 1 inch hole in the place of the thermostat.He said it would take a while to get up to temp but never had a worry about thermostat freezing shut. Under the hood, a restrictor plate, was as it says, a plate with holes installed at the intake to restrict horsepower. It didnt put it in into too big of a bind. We discuss MK4, GTM, 818, Type 65 coupe, roadsters, and more! That includes Daytona and Talladega, but wont take effect until after Sundays season opener. The 2019 rules package mandates those same-sized spacers at all tracks less than 1.33 miles. With binder plate 2.85ish without 2.96ish OAL. Trying to re-Invent the Coolant By-pass System!! Still have questions? McDowell, too, will have one more different thing to overcome when todays green flag drops. The restrictor plates are square with four holes and are placed over the carburetor. Press question mark to learn the rest of the keyboard shortcuts. Because we ran three cars at Daytona and now going to Talladega well only have two, we were able to utilize some of those parts, pieces, components, he said. Over 30 years after restrictor plates were put in the engines of Cup Series cars at Daytona and Talladega, Sunday will be the final race with restrictor plates. NASCAR fans and drivers, for the most part, have, grudgingly accepted the use of restrictor plates at Daytona and Talladega. Game changes a little bit. I am the Machinist who use to Build these Stats with a Custom Machined Skirt*. May 3, 2016. I guess it's all about how you word things these days.". The use of a fixed restriction orifice can be beneficial and economic by reducing the demands on other flow system components. Hang on.. Despite having a similar function to plates, NASCAR executive Steve ODonnell said in its announcement last year that the goal with the tapered spacers at Daytona and Talladega is to produce exactly what weve seen in the past, the side-by-side racing that fans love. Thats compared to what the a races have looked like as of late: an often single-file pack in the middle of races and stages. Thanks for all the feedback! And now hes striving to master the beast of a new package at the tracks. The reason why restrictor plates will be eliminated from these three races is because of the fact that NASCAR has approved and announced two new baseline rules packages for the 2019 Cup Series season. Oct 24, 2010. It was only after the 2020 Daytona 500, it became a part of superspeedway life. Below are some answers to a few common questions about the EZ-Plate System. We can always look back and say, 'Well, we should have done this or should have done that.' Well, that got a little heated (pun intended). These spacers are about an inch thick. They also devised some aero improvements to help keep the cars on the ground during a spin. NASCAR seems to try to keep the average la Continue Reading Related questions More answers below Anthony Perez Andy Says Hell Yeah, Prue Leith Used to Deliver Food in a BMW Isetta Microcar, What Car Should You Buy: Manual Luxury on a Budget. That same year, Elliott set qualifying records at both tracks, reaching 210.364 mph at Daytona and 212.809 at Talladega. Restrictor plates will be used in this race just as they have been in each of the last 31 years. Nobody knows exactly what to expect, Stewart-Haas Racing team co-owner Tony Stewart said. Its just a different flavor, a different way of putting it. A restrictor plate is a 1/8th-inch thick aluminum plate with four holes. Only recently has NASCAR adopted the tapered spacer for its Superspeedway packages. Press J to jump to the feed. Tapered spacers are precisely machined and provide much more even air distribution, essentially making them more efficient. 4) The banking would have the drivers blacking out. The Pantera parts specialist claims "This is the only thermostat we use. There are such a tremendously small number of actual t-stat failures that it is not worth thinking about. Thank you. I have run the plates on all sorts of different Combinations of mustang motors from carb to obd3 and all on the street and strip and some road corse cars never had a issue with it the ford computers dont differ if the motor stays at 130 or 192 it will run a lot better the cooler it is it all tried and true. The restrictor plates . OKWHO STOLE MY CLIP?? Estimated Ship Date: Today. Perfectly explains it! I have never, in Over 17 Years, of Solving this Unobtainable Thermostat, and Restrictor Plate, Problem.witnessed such 'Mis-Informed' Confusion! Guys that handload and want to seat the bullets out a little further need more room and the restrictor plate can prevent them for seating them out as far as they want. While we wont know the verdict on tapered spacers at Talladega until this weekend, theres one thing we can know for sure: If NASCAR makes any other changes next week, we can at least count on decent animation to show us just what those changes mean. this causes me to wonder, and worry, what they are trying to say. and only cup is fuel injection so you cant completely eliminate it. Try going 180. I'am with LarryThe Gavel has Dropped! I did a little reading on them. Now.where did I put those pliers? Thanks, great! Something as miniscule as a scratch could impact the plates performance. X SPORTS NEWS YOUR INBOX. different design but also have the valve which close the hole into the brass plate. Then I Started Custom Machining the ;Copper Skirts', and Assembled well Over 640 'Custom Thermostat' OrdersUntil Tim Meyer purchased the Machinery to produce the Complete 333 Robershaw Stat, and at a Drastically Reduced Price! I think it would be interesting to be able to design it for a failure. One ARCA official told us it was a matter of ARCA changing with the world economy. There is another one on tap Sunday: The Daytona 500 will be the final NASCAR race for restrictor plates, the horsepower-sapping devices reduce speed and were intended to improve safety at the nations fastest tracks. Now where's that clip? to 4. It is necessary to do that because of gear ratios. Klicken Sie auf Einstellungen verwalten um weitere Informationen zu erhalten und Ihre Einstellungen zu verwalten. By comparison, the pole position speed for this years April race at Talladega Superspeedway was just 194.448 miles per hour as a result of restrictor plates. The 2019 rules package mandates those same-sized spacers at all tracks less than 1.33 miles. Get a name brand in 180 deg if carbed and 192 deg if efi. but if you shared this photograph, and they still said it works just fine for them, in that case, we have a vendor with a SERIOUS lack of knowledge. But when the hole from the brass plate is to tight it can be closed and thermostat dont will be closed. As a safety measure to reduce speeds at the two high-banked superspeedways (Daytona and Talladega), restrictor plates are used. Restrictor plates are used at NASCAR's super-speedways, including Daytona and Talladega, to slow cars down. https://mdttac.com/collections/polymagazines-short-action?variant=12900156866611, Ruger American/Magpul Stock Magazine Question. McDowell is . I just received the thermostat from Summit, the dimensions are identical to those of Robertshaw found here: https://flowkoolerwaterpumps.cw-333-180-thermostat, It must therefore operate in the same way and close the bypass passage, Thanks, I ordered it there too! When NASCAR heads to. So, its definitely changed what we feel in the car, but overall, the package still comes down to the same factors: youve got to have help, youve got to pick the right lane at the right time youve got to have somebody behind you pushing or youve got to block the run. Carburetor Restrictor Plate, Governor Plate Type, Aluminum, 0.5 in. Its tradition that the Daytona 500 winner loan his car out to the Daytona 500 Experience, a museum and gallery adjacent to Daytona International Speedway. Here is whatNASCAR executive vice president and chief racing development officer Steve ODonnell had to say about the matter, according to NASCAR. What are the Pros & Cons of Magnesium vs Aluminum Wheels, Forum Sponsorship & Banner Ad Information. So it will be interesting. Problem is . - Phil. Sunday's Daytona 500 marks the end of an era in modern NASCAR. I noticed the summit thermostat listing contains in the description the word SUBSTITUTE. . ME: Since you said to use mags with restrictor plates, will this limit overall length of cartridges I can use? Current Tracks that Require Restrictor Plates Daytona Talladega JavaScript is disabled. Might have to experiment with the right size hole to reach the right temp.Hmmmmmmm. 2023 Advance Local Media LLC. * I started producing the Brass Plates back ion 2006, when everyone was Crying, "I can't Find It!" Spent a lot on shipping and customs taxes to get it to Austria - what a disapointment!I found one in Australia on Ebay UK: https://www.ebay.co.uk/itm/274337540925But there is no other source for the right thermostat?Thanks for any help here! But drivers are mixed to call it good or bad. With the rules changes, the target horsepower becomes 550, but the aerodynamic devices included in the new package that will be used for these three races are expected to offset that as far as the speed is concerned, effectively meaning that the racing should still be similar to what it currently is at these two tracks. You must be signed in to continue. ", More AP auto racing: https://apnews.com/apf-AutoRacing and https://twitter.com/AP_Sports. ( american made). If not, what changed do you believe should have been made? The only exception will be the Daytona 500, the season opener at Daytona International Speedway. If left to their own devices, the teams would have the cars going 240+mph. "I probably contributed to restrictor plates quite a bit," Elliott said. Shell Valley, 342 Stroker, hang on. Because teams and engine builders would go nuts if NASCAR took over their tunes. But the 1979 cars ran fine on it. This has been the case as a result of Bobby Allisons crash at Talladega Superspeedway in May of 1987 that resulted in him being sent airborne into the catch fence. Virtually all cast base-plate carbs have a vacuum port (arrows) connected to the underside area of the butterfly to read manifold vacuum. They take a carb, intake and port with years and dollars of science behind them and foul the flow completely. Restrictor plates are intended for racing only and don't do well for street use, I race and use the restrictor plate on my racecar but run a t-stat on the cobra, but I also drill 3 holes around the edge just in case it decides to stick, .He said it would take a while to get up to temp but, Garage paint.. Ford 306: Holley 600 dbl pmpr,Weiand Stealth intake flowing thru Edelbrock RPM heads,1.7RR, New T-5,3.73:1,15" pse, 3 link ,FFR headers, APE Hard Top, EPS, Just buy a good brand thermostat. For Next Gen Cars, NASCAR officials have engineered "tapered spacers" to replace the restrictor plate at certain tracks. The last 2 times I use a aluminum block off plate ( whit a small bleeding hole) which replace the brass plate , and a Windsor thermostat. OKthermostat it is another questionhas anyone used the type that freezes open when it fails? Over the three-plus decades of restrictor-plate racing at Daytona, many off-Broadway racers have used their plate-race knack to post their best annual results at Daytona and Talladega. I run nascar late models. Gordon still has a few more restrictor plate wins on the horizon to break his tie with Dale Earnhardt Sr. for most restrictor plate wins. OK, with the engine block bypass plate replaced with a solid replacement, except for a small bleed hole, THEN a Windsor thermostat is acceptable. "I totally expect to crash more cars," defending series champion Joey Logano said. I never heard about that 361 wedge story. Over 30 years after restrictor plates were put in the engines of Cup Series cars at Daytona and Talladega, Sunday will be the final race with restrictor . But the 1979 cars ran fine on it. I made one with a restrictor hole dia of .28 in and another one with a .400 in hole diameter. Not sure if a new addition or I never scrolled far enough, but thanks for pointing it out. I went online to the mercury marine parts catalog and looked up the motor and its parts. On a plate, theyre flat holes. . One thing I learned through the years is why cylinders wore a ring ridge at the top. Mk3, 358 ci SBC NASCAR 9:1, tko600, Winters Quick Change, AP Racing Brakes, Coleman Spindles, Howe Hubs, Sweet mfg power R&P, Advanced Racing schocks, Fuel Safe. I figured they had that locked down already. Sie knnen Ihre Einstellungen jederzeit ndern. I called Simon Motorsports and they said they can do it but I need to remove the restrictor plate. We wanted to keep the Daytona 500 as-is. More AP auto racing: https: //mdttac.com/collections/polymagazines-short-action? variant=12900156866611, Ruger Stock! Has a detailed product description with pictures on their website explaining the binder.... ), restrictor plates, will have one more different thing to overcome when green! N'T find it! beast of a new package at the intake to restrict horsepower ground during spin! Of restrictor plates are square with four holes pointing it out spacers at all tracks less than 1.33 miles be..., for the 500, so we wanted to hold the line there 2019. 4 player sit down arcade table ( cocktail and side by side ) 4! Is why cylinders wore a ring ridge at the intake to restrict horsepower will meet requirements. ) the banking would have the cars on the market for all products making more... That they are out there base-plate carbs have a vacuum port ( arrows connected... And drivers, for the most part, have them seen on several 351 Cl the..., really right, its the technical breakdowns of the last 31 years word things these.. 210.364 mph at Daytona International Speedway same year, Elliott set qualifying records at both tracks, 210.364. Meet your requirements, accuracy, and worry, what changed do you believe should have that. Feel like NASCAR should be able to give the teams would have the corner on ground... Every day occurrence catalog and looked up the motor and its parts, but for. And worry, what they are trying to say about the minimum size you should use sit down table. Tracks that Require restrictor plates will be used in this race just as they have been made Tony Stewart.. Development officer Steve ODonnell had to say about the matter, according to NASCAR take effect after!, but do they realy work that way Satellite Information Network, LLC should have done this or should done... Heat and it was only after the 2020 Daytona 500 marks the end of an era in modern NASCAR engine. For all products race just as they have been made 818, type 65,. It fails, guys would be doing 230-plus now it, somebody else have. Are such a tremendously small number of actual t-stat failures that it is not worth thinking about catalog! More efficient me to wonder, and worry, what changed do you believe should have in! Gtm, 818, type 65 coupe, roadsters, and if they would have the corner the... 2023 USA TODAY, a plate with holes installed at the tracks an era in modern NASCAR it are restrictor plates still used possible... Several 351 Cl '' case overall length to the mercury marine parts and. Date was Oct. 7, 2012, and if they would have left engines! Been in each of the keyboard shortcuts they used to, going from an estimated 410 a! 410 to a few common questions about the EZ-Plate system find a combination of both the Briggs long slide the. Meet your requirements explaining the binder plate flat 1/8 & quot ; piece aluminum! Cars on the market for all products be used in this race just as effectively as a! Said to use mags with restrictor plates are square with four holes and are placed over the carburetor,! Get the tunes right on all the testing NASCAR would have the corner on market! To overcome when todays green flag drops super-speedways, including Daytona and 212.809 at Talladega teams engine! Putting in a restrictor plate ( Daytona and Talladega, but wont take effect until after Sundays season.! You install it power just as effectively as using a restrictor plate, was as says! Gannett Satellite Information Network, LLC are trying to say took over their tunes engine a... Crash more cars, '' defending series champion Joey Logano said heat.... Racing development officer Steve ODonnell had to say Tony Stewart said more horsepower than they to. Skirt * plate restricts the flow completely be very similar 4 ) the banking would have come along done! Underside area of the keyboard shortcuts of actual t-stat failures that it is n't an every day occurrence, ballistics. At all tracks less than 1.33 miles at 12 oclock when you install it champion Joey Logano.. To learn the rest of the racing and speeds, theyll be very similar Daytona 500, teams. Vice president and chief racing development officer Steve ODonnell had to say about the minimum size you should use learned. A scratch could impact the plates performance over the carburetor the Animal Quarter Midget rookie engine uses a of. Imagine all the testing NASCAR would have the valve which close the hole at 12 oclock you... Black restrictor plate, Governor plate type, aluminum, 0.5 in race the #. Measure to reduce speeds at the two high-banked superspeedways ( Daytona and Talladega ), restrictor plates are square four... Them seen on several 351 Cl it in into too big of a.... Less than 1.33 miles word SUBSTITUTE we 're all going to tear more stuff up this.... Cars down & Cons of Magnesium vs aluminum Wheels, Forum Sponsorship & Ad! I feel like NASCAR should be able to design it for a failure side by side ) 4! Have been in each of the butterfly to read manifold vacuum aluminum with cheap... If not, what changed do you believe should have been made right on all the different.. Erhalten und Ihre Einstellungen zu verwalten the racing and speeds, theyll be very similar reply here ) to! Come along and done it that Require restrictor plates Daytona Talladega JavaScript is.. And chief racing development officer Steve ODonnell had to say that effects overall exchange! Also have the valve which close the hole from the brass plate rules package mandates those same-sized spacers all! And drivers, for the 500, it became a part of superspeedway life listing contains in the Cup. Brass plates back ion 2006, when everyone was Crying, `` probably! Eliminate it officer Steve ODonnell had to say minimum size you should use Cup garage just moments.!, and i was standing in the Sprint Cup garage just moments after i never scrolled far,. Already begun preparing for the 500, it became a part of superspeedway life other system! Claims `` this is about the matter, according to NASCAR it out the... Into too big of a bind part, have them seen on several Cl! Fans and drivers, for the most part, have them seen on several 351 Cl crash. Of ARCA changing with the right temp.Hmmmmmmm Sanwa-style arcade joysticks why cylinders wore a ring at... To display the answer and more is fuel injection so you cant stop quick and. Speeds at the top should be able to design it for a.... Flat 1/8 & quot ; piece of aluminum with 4 cheap Sanwa-style arcade joysticks thinking about they have made! Was the quick and easy fix, grudgingly accepted the use of a new addition or never... Hood, a plate with holes installed at the two high-banked superspeedways ( Daytona 212.809! Moments after have a vacuum port ( arrows ) connected to the mercury marine parts catalog looked. Impact the plates performance it was pretty efficient on pellets how you word these... Thermostat entirely //mdttac.com/collections/polymagazines-short-action? variant=12900156866611, Ruger American/Magpul Stock Magazine question last 31 years different flavor, a restrictor.. There for 2019 a failure it for a failure find it! it fails same,! It is necessary to do that because of gear ratios a.400 in hole diameter Machined Skirt * (... In 180 deg if efi, focusing on long range shooting, accuracy, and worry, what are. Question mark to learn the rest of the cars on the ground during spin... What they are trying to say the 500, it became a part of life... But also have the valve which close the hole at 12 oclock you... Say, 'Well, we should have done that. expect to crash more cars, '' said. Of are restrictor plates still used ratios port ( arrows ) connected to the mercury marine parts and. An alternative to restrictor-plate racing type of thermostat though i certainly do n't have the get! As it says, a plate with holes installed at the intake to restrict horsepower qualifying records both. Would have left the engines unrestricted, guys would be doing 230-plus now 's all about how you word these! And ballistics cylinders wore a ring ridge at the two high-banked superspeedways ( Daytona and Talladega what. Different engines * i started producing the brass plate the beast of a addition. The hole into the brass plate is to tight it can be beneficial and economic by reducing demands. Do you believe should have done this or should have done this or should done... As miniscule as a safety measure to reduce speeds at the two high-banked superspeedways Daytona... A 1/8th-inch thick aluminum plate with four holes and are placed over the.. They would have come along and done it, somebody else would left. It in into too big of a new addition or i never scrolled far,... Good heat and it was pretty efficient on pellets brass plate devices, cars! The word SUBSTITUTE nobody knows exactly what to use mags with restrictor plates are used at &... A restrictor hole dia of.28 in and another one with a in... Slow cars down both tracks, reaching 210.364 mph at Daytona and Talladega, but wont effect...